Since the successful development of the shale gas test well group in Fuling shale gas field in 2013，the cumulative yearly shale gas production capacity of 10.0 billion cubic meters has been built by the end of 2017.Due to the impact of geologic conditions and technical measures on shale gas wells，the production performance of shale gas wells is significantly different from that of the conventional gas wells.The rapid decrease in initial production and long-time linear flow result in great difficulties in accurate calculation of gas production per unit pressure decrease and well-controlled dynamic reserves，and thus in proper design of gas field development scenarios.Therefore，based on the accurate grasp of the production characteristics of shale gas，the prediction method of gas production per unit pressure decrease and well-controlled reserves were set up in terms of the production data of some typical producing wells in the block，and could be used for effective prediction of the changes in gas production per unit pressure decrease and well-controlled reserves with production time.The study showed that the angle between the extension direction of horizontal section and the maximum principal stress should be as less than 40° as possible，the well spacing should be within 400-600m，and wells should be deployed as cluster cross wells in the pattern of “six wells per pad”，so as to make full use of existing platforms and available resources，to provide guidance for the construction scale of gasfield，to realize the effective large-scale development of shale gas，and to serve as a reference for the economical and effective development of southern marine shale gasfields and other gas fields of the same type at home and abroad.